Horizon mapping cleanup and bugfixes (#21450)

Fixes https://github.com/Aurorastation/Aurora.3/issues/21289
Fixes https://github.com/Aurorastation/Aurora.3/issues/15779

Handles a lot of mapping cleanup, container definitions for the Horizon,
and several bugfixes found along the way.

changes:
- code_imp: "Added set definitions for several Horizon-specific
containers."
- code_imp: "Updated 'full' material stacks on the Horizon from sneaky
var-edited singles to properly defined full stacks"
- code_imp: "Cleaned up all Air Alarms, Fire Alarms, and APCs on the
Horizon that were directional children with their dir var edited."
- code_imp: "Cleaned up all Power Cables on the Horizon that had d1 or
d2 var edited instead of just icon_state."
- code_imp: "Adjusted pixel shifts for 'south' (north-facing) Air
Alarms, Fire Alarms, APCs, and Extinguisher Cabinets to address layering
issues when standing vs. leaning."
- code_imp: "Minor refactor of shuttle/* Air Alarms and APCs to reduce
excess children; req_one_access perms now assigned based on
/area/horizon/shuttle/*."
  - qol: "Adds feedback hint for uses remaining to Emag cards."
- qol: "Added Tip about the shift-click behavior of the 'up-hint'/'Look
Up' button."
- bugfix: "See-through turfs (like lattices/catwalks over open space)
can now be Looked Up through from below."
- bugfix: "Fixed the shift-click behavior of 'up-hint'/'Look Up' button,
allowing you to see nearby turfs that can be Looked Up through."
- bugfix: "Maintenance Panels located on the floor have had their
layering issues fixed."
- bugfix: "Borg eye emissive effects MAYBE no longer visible through
higher z-levels."
- bugfix: "Added missing leanable component to window/shuttle obj type."

code/game/objects/items/weapons/cards_ids.dm

@@ -86,6 +86,10 @@
 	origin_tech = list(TECH_MAGNET = 2, TECH_ILLEGAL = 2)
 	var/uses = 10
 
+/obj/item/card/emag/feedback_hints(mob/user, distance, is_adjacent)
+	. += ..()
+	. += SPAN_NOTICE("\The [src] has [uses] use\s left.")
+
 /obj/item/card/emag_broken
 	desc = "It's a card with a magnetic strip attached to some circuitry. It looks too busted to be used for anything but salvage."
 	name = "broken cryptographic sequencer"